In short, the steps you should take are: Test that your dongle actually needs RTL8812BU drivers: In a terminal ( Ctrl + Alt + T) run: lsusb. This will give you something like: Bus 001 Device 002: ID 2357:0115. Google the ID number, e.g. "wiki 2357:0115", and you will find out which Realtek driver you need.
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